Vacancy recovery and vacancy-hydrogen interaction in niobium and tantalum studied by positrons
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© 1985 American Physical Society (APS). This is the accepted version of the following article: Hautojarvi, P. & Huomo, H. & Puska, Martti J. & Vehanen, A. 1985. Vacancy recovery and vacancy-hydrogen interaction in niobium and tantalum studied by positrons. Physical Review B. Volume 32, Issue 7. 4326-4331. ISSN 1550-235X (electronic). DOI: 10.1103/physrevb.32.4326, which has been published in final form at http://journals.aps.org/prb/abstract/10.1103/PhysRevB.32.4326.
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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Date
1985
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Mcode
Degree programme
Language
en
Pages
4326-4331
Series
Physical Review B, Volume 32, Issue 7
Abstract
Positron-lifetime measurements in electron-irradiated pure Nb and Ta show that monovacancy migration occurs at 220 and 260 K, respectively. Hydrogen impurities can be bound to vacancies, as is experimentally observed in Ta at 70 K after low-temperature α-particle irradiation. The vacancy-hydrogen complex formation shifts the vacancy migration to higher temperatures. Vacancy-hydrogen complexes retain the capability to trap positrons. Theoretical calculations performed for hydrogen and positron states at vacancies are in agreement with experimental findings.Description
Keywords
vagancy-hydrogen complexes, positron states
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Citation
Hautojarvi, P. & Huomo, H. & Puska, Martti J. & Vehanen, A. 1985. Vacancy recovery and vacancy-hydrogen interaction in niobium and tantalum studied by positrons. Physical Review B. Volume 32, Issue 7. 4326-4331. ISSN 1550-235X (electronic). DOI: 10.1103/physrevb.32.4326.